HGH or IGF-1 can’t compare to steroids when you talk about fast mass gains. Steroids inflate your muscle cells, and they stay inflated while you’re on them and while you work out, but when you stop, the muscle mass is reduced back to normal.
However with HGH or IGF new muscle cells are created, so it’s more long term quallity gains. I can tell you only from my personal experience. When I was first on HGH I noticed amazing pumps, I couldn’t even finish my normal workout routines because of the pumps. After about a month I noticed that my body has changed and I got more “baywatch type” phisique.. less body fat, nice muscle shape. Bottom line, HGH and IGF are not for mass building, it’s for body shaping and regenerating. It goes great combined with steroids though. Nice, clean testosterone + HGH (or IGF) is the ultimate cycle for any bodybuilder.